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Laabri

3.3 DNA Replication Mastery Check

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5.

Order the steps of DNA replication (first step goes at top)

  1. Polymerase builds complimentary DNA strand

  2. Ligase bonds the new DNA fragments to finalize the new strand

  3. DNA is unzipped by breaking hydrogen bonds between base pairs

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1.

DNA replication is like making a copy of a recipe so that every cell in your body can have the instructions it needs to work properly. It happens during a part of the cell cycle called the S phase. The cell cycle is a series of stages that a cell goes through to grow and divide. First, the cell grows and gets ready to make copies of itself. Then, during DNA replication, it carefully makes an exact copy of its DNA. Finally, the cell divides into two new cells, each with its own set of DNA. This process is essential for growth, healing, and replacing old cells.

Why is it important for DNA Replication to occur before cell division?

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2.

Enzymes are like tiny helpers that make DNA replication smooth and accurate. One important enzyme, called DNA helicase, acts like a pair of scissors, unwinding and separating the two strands of the DNA double helix. Another enzyme, DNA polymerase, is like a builder; it adds new building blocks to each of the separated strands, creating two new DNA strands that are identical to the original. There are also other helpers like DNA ligase, which stitches together any gaps in the new DNA strands. All these enzymes work together to make sure that each new cell gets the right set of DNA instructions.

What is the role of helicase in DNA replication?

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3.

During DNA replication, what does 'semi-conservative' mean?

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4.

What are the components that make up a DNA nucleotide?

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6.

One strand of DNA has the following base sequence (template strand):

GATCGC

What would be the base sequence on the opposite strand (complementary strand) of DNA?